3 years ago

Evaluate 4x + 5y , when x = 7 and y = 10

Mathematics

2 answers:

Sladkaya [172]3 years ago

5 0

Hi ;-)

$x=7 \ and \ y=10\\\\4x+5y=4\cdot7+5\cdot10=28+50=\boxed{78}$

MAXImum [283]3 years ago

3 0

Step-by-step explanation:

4x + 5y

4 × 7 + 5 × 10

28 + 50

Therefore its 78.

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vaieri [72.5K]

YES. She is correct.

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Equations are equivalent

Their solutions:

$\dfrac{x}{16}=4\qquad\text{multiply both sides by 16}\\\\x=4\cdot16\\\\\boxed{x=64}\\----------\\\\\dfrac{x}{4}=16\qquad\text{multiply both sides by 4}\\\\x=16\cdot4\\\\\boxed{x=64}$