Solve {l}{2*7+5*-4=-6}{3*7-2*-4=-9}

$$\left. \begin{array} { l } { 2 \cdot 7 + 5 \cdot - 4 = - 6 } \\ { 3 \cdot 7 - 2 \cdot - 4 = - 9 } \end{array} \right.$$

Verify

Solution Steps

Multiply 2 and 7 to get 14. Multiply 5 and -4 to get -20.

$$14-20=-6\text{ and }3\times 7-2\left(-4\right)=-9$$

Subtract 20 from 14 to get -6.

$$-6=-6\text{ and }3\times 7-2\left(-4\right)=-9$$

Compare -6 and -6.

$$\text{true}\text{ and }3\times 7-2\left(-4\right)=-9$$

Multiply 3 and 7 to get 21.

$$\text{true}\text{ and }21-2\left(-4\right)=-9$$

Multiply 2 and -4 to get -8.

$$\text{true}\text{ and }21-\left(-8\right)=-9$$

The opposite of -8 is 8.

$$\text{true}\text{ and }21+8=-9$$

Add 21 and 8 to get 29.

$$\text{true}\text{ and }29=-9$$

Compare 29 and -9.

$$\text{true}\text{ and }\text{false}$$

The conjunction of \text{true} and \text{false} is \text{false}.

$$\text{false}$$